cpreg_vmstate_indexes is a VARRAY_INT32. A negative value for
cpreg_vmstate_array_len will cause a buffer overflow.
An user able to alter the savevm data (either on the disk or over the wire
during migration) could use this flaw to to corrupt QEMU process memory on
the (destination) host, which could potentially result in arbitrary code
execution on the host with the privileges of the QEMU process.
Upstream fix:
-------------
-> http://git.qemu.org/?p=qemu.git;a=commit;h=d2ef4b61fe6d33d2a5dcf100a9b9440de341ad62

Statement:
Not vulnerable.
This issue does not affect the versions of kvm package as shipped with
Red Hat Enterprise Linux 5.
This issue does not affect the versions of qemu-kvm package as shipped
with Red Hat Enterprise Linux 6